<template> 
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div 
                        class="button-wrapper" 
                        v-for="item of hot" 
                        :key="item.id"
                        @click="handleCityClick(item.name)"
                        >
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <div 
                class="area" 
                v-for="(item, key) of cities" 
                :key="key"
                :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div 
                    class="item-list" 
                    v-for="innerItem of item" 
                    :key="innerItem.id"
                    @click="handleCityClick(innerItem.name)"
                    >
                    <div class="item border-bottom">{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>   
</template>


<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props: {
        hot: Array,
        cities: Object,
        letter: String
    },
    computed: {
        ...mapState({
            currentCity: 'city'
        })
    },
    methods: {
        handleCityClick(city){
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    watch: {
        letter () { 
            if(this.letter){
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs .wrapper)
    }
}
</script>


<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc
    .border-bottom
        &:before
            border-color #ccc
    .list
        overflow hidden
        position absolute 
        top 1.78rem
        left 0
        right 0
        bottom 0
        .title
            background #eee 
            line-height .54rem
            padding-left 0.2rem
            font-size .26rem
            color #666
        .button-list
            padding: .1rem .6rem .1rem .1rem
            overflow hidden //创建一个bfc区域
            .button-wrapper
                float left
                width 33.33%
                .button
                    margin .1rem
                    padding .1rem 0
                    text-align center
                    border 0.02rem solid #ccc
                    border-radius 0.06rem
        .item-list
            .item
                padding-left .2rem
                line-height .7rem
</style>

